Pinion Depth Measurement

Pinion depth measurement is taken with the pinion head and tail bearing cups pressed into the axle housing without the shim.

Fig 1: Pinion Head Bearing Cup Installation

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1. Press pinion head bearing cup into housing using Handle C-4171 (1) and Installer C-4310 (2).
   Fig 2: Pinion Tail Bearing Cup Installation

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2. Press pinion tail bearing cup into housing using Handle C-4171 (1) and Installer D-146 (2).
   Fig 3: L-Block, Gage Block and Bearing

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3. Assemble Pinion Height Block 6739 (3), Pinion Head Bearing Cone (1), Screw 6741 (all these can be found in a Pinion Gauge Set such as 6774), and Pinion Height Gage Block 9227 (2). Install assembly into axle housing and through bearing cups.
   Fig 4: Pinion Depth Gauge Tools - Typical

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4. Install pinion tail bearing and Cone 6740 (4). Tighten Cone 6740 by hand until 3.4 N.m (30 in. lbs.) of rotating torque is measured at Screw 6741 (5).
   Fig 5: Remove/Install Arbor Discs

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5. Install Arbor Discs 9228 (1).
   Fig 6: Remove/Install Arbor Bar

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6. Install Arbor Bar D-115-3 (1) from a Pinion Gauge Set such as 6774.
   Fig 7: Pinion Gage Setup

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7. Verify pinion depth setup is as shown in illustration.
   Fig 8: Indicator/Scooter Block Setup

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8. Install Dial Indicator 9524 (1) to Scooter Block D-115-2A (2) ( from a Pinion Gauge Set such as 6774). Secure with set-screw (3).
   Fig 9: Zero Dial Indicator on L-Block

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9. Install Indicator/Block assembly to top of Pinion Height Block 6739 (1). Zero indicator on top surface.
   Fig 10: Measure and Record Required Shim

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10. Slide indicator probe off of height block and onto Arbor Bar D-115-3 (2). As indicator contacts Arbor Bar (2), indicator needle will rotate clockwise. Continue moving indicator probe to the crest of the arbor bar and record the highest reading.
11. Select a shim equal to the dial indicator reading minus 2.5 mm (0.09 in.). After shim installation, check the amount of pinion bearing preload, and adjust as required to achieve the correct turning torque.